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Text in the Subject and Body of the message will be ignored. Osgeld Faraday Member Posts: Keep in mind the adapter you have may be putting out more than 9 volts, or may not have a very clean output, both of which will make the regulator get hot.
The battery is a little over 9V. I’m pretty sure Cap value correlates to the noise frequency, so no, you can’t just “go over” the value and still have the same effect. Check your caps, it might be leaky. I will try datxsheet with the additional cap. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.
Basic Stamp List Subject: That would work alright.
LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)
Friday, December 05, Now that I look at it again, it seems that the markings on the package don’t match up with dataasheet datasheet. I wonder if this will pose a problem.
If you aren’t running very much current, and your Vin isn’t too high, a small clip-on heat sink can significantly reduce the regulator’s temperature. If you look at the diagram on the first page you will see some asterisks next datashedt the capacitors. The cap values are related to the frequency of the noise to be filtered.
LM2940ct 5.0 gets HOT quick.
Thanks for the insight, guys. Photos – easier uploading and sharing. If I hook up another 9V in parallel to add more currentdatqsheet suddenly jumps to around 7V which I would expect if it were in series, but it’s not.
Lm2940dt-5.0 is subject to http: The wiring diagrams in the datasheet include capacitors, but I assume that these are for smoothing out ripple, and would have no effect on this massive increase in voltage I’m seeing. Another data sheet says 0. I have a 22uf cap between the output and ground as specified in the datasheet for stability.
Does it have a backlight? I originally thought my caps were too high in value, then I saw that the value used was a minimum.
Another, does your LCD has backlights? It is essential that the output capacitor meet these requirements, or oscillations can result. The circuit I’m building works fine with a 5V regulated supply one you plug into the wallbut I’d like to expand the design to work off of batteries as well. Did you take steps to obtain caps with appropriate ESR?
My camera had a hard time catching the writing so I’ve added labels so you can see what’s printed on it. Otherwise the output impedance is too high and it oscillates. According to the diagram Input is on the left, GND is in the middle, and the 5V output should be on the right. I went digging through my dad’s old junk box and found a 16V, uF electrolytic cap.
Can you let us know what is printed on the dataseet line? Quick Links Categories Recent Discussions. Hi John, What is the input voltage to the regulator — can you measure it? Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. What are the caps on the BS2P40 demo board? Thanks, John In basicstamps yahoogroups.
OK – I see the third line info now! My input is 9V, I’m using the power supply that came with the P40 demo board. I picked up some 5V 1A voltage regulators at a shop in town. Voltage regulator not working as expected. There is another possibility The only things being powered in the circuit is the stamp and the LCD.
Thank you for all the input. I can’t find a schematic of it. How’s that for redundancy? Here’s a snip from p. The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.
LMct gets HOT quick. — Parallax Forums
Do you know about how much output current you have? Many xatasheet the regulators require capacitance on the input and output to minimize oscillation. Your use of Yahoo! Is dataxheet just because of the load placed on it due to the lcd?
I use these all the time, quite handy, especially with batteries since it can take a hit with the polarity hooked up backwards I can confirm for you that Left is Vin Middle is GND Right is output ive never tried without cap’s but yes they are for smoothing, but I dont know what effect outside of that they have my little breadboard bug that i made is rock solid 4.
Click for larger version I found a datasheet here: